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C. W. BOMAN.

- PENCIL. APPLICATION FILED MA Y28,1920.

Patented Nov. 2, 1920.

UNITED STATES GLAES WM. ROMAN, OF NEW YORK, N. Y., ASSIGNOR 'I'O EAGLEPENGIL COMPANY, OF

PATENT OFFICE.

NEW YORK,--IN". Y.

PENCIL.

Specification of Letters Patent.

Patented Nov. 2, 1920.

Application filed May 28, 1920. Serial No. 885,029.

ticularly, to a pencil of this kind designed to hold and control the movement of leads of very small diameter. My invention consists of certain improvements in a pencil of this kind which will be first described in connection with the accompanying drawings forming part of this specification and will then be more specifically pointed out in the claims.

In said drawings-- Figure l is an axial section of a pencil embodying my improvements.

Fig. 2 is a view of the pencil with the outer case or inclosing shell removed, the cap which closes the lead reservoir at the rear end of the pencil being represented in detached position.

Fig. 3 is a detached View of the pencil case, or outer inclosing shell of the pencil.

Fig. 4c is a detached view of the inner sheath which incloses the movement and has a swiveled connection at its front end with the body portion of the pencil.

Fig. 5 a view of the parts of the movement-in this instance of the propelling type-detached from one another.

Fig. 6 is a detached view of the body portion of the pencil and nozzle for guiding and supporting and frictionally holding the lead.

The drawing is upon a somewhat enlarged scale in order that the structural details of the device may be more plainly visible. In the longitudinal sectional view Fig. l the sheath is wider proportionally to its length than inthe other figures, and the assembled parts within it are also represented upon a lar 'er scale.

'fhe tubular cylindrical body portion A of the pencil (Figs. 1 and 6) terminates at its nozzle end a in a slender tubular stem at to contain the lead, the front portion of said stem being split to provide jaws or clamping faces between which the lead inserted in said stem is frictionally held as customary in devices of thiskind. Fast to and extending rearwardly from the cylindrical body portion A is a cylindrical longitudinally fluted sheet metal barrel Z) of relatively smaller diameter, in which the movement is housed. Upon the cylindrical body por tion and extending rearwardly therefrom is fixedly secured a sleeve a said sleeve being of sufficiently greater diameter than the barrel b, the front portion of which itencircles, to leave between the two an annular space, as shown more plainly in Fig. 6, for purposes hereinafter mentioned.

The movement (Fig. 5) comprises essentially a longitudinally movable lead advancer or pusher and a rotatable propelling screw. The lead pusher, which is placed within the fluted barrel 5, consists of a sheet metal cylindrical tube at on the front end of which is a slender rod 6 of sufficiently small diameter to enter and move easily within the tubular stem a at the nozzle end of the body portion A.. Upon the rear end of the pusher tube (Z is mounted and made fast a section of longitudinally fluted sheet metal tube, which, when the pusher is inserted in the fluted barrel 1) of the body portion, will fit snugly therein, with its flutes engaging those of the barrel Z), whereby the lead pusher is permitted longitudinal movement only in the barrel 2) in which it is housed.

Other known means of preventing rotary movement of the one with respect to the other may be substituted for the flutes, what is essential being that the pusher shall be capable of longitudinal movement only in the barrel. The propeller screw 9 is a solid externally-threaded rod which is received and fits snugly in the pusher tube d in which it can rotate. The screw thread in the propeller screw is enga ed by a suitable pin projecting inwardly from the pusher tube to engage the thread in the screw. The pin consists in the present instance of a projection 7 on the fluted sheet metal section Upon the rear end of the propeller screw 9 is fixed a cup-like cylindrical sheet metal head 9. An inner sheet metal cylindrical sheath 71. encircles that part of the body portion of the pencil containing the movement, and has a swiveled connection at its front end with the body portion A, and at its other end receives and is made fast to the head 9 of the movement, as in my Patent No. 986,896, of March 14, 1911, on which the invention embraced in the present application is an improvement. The swiveled connection between the body portion A and the sheath h is effected, in the present in stance, through the intermediary of the front end of the sheath which is received in the annular space between fixed sleeve (0 and the fluted barrel 7), and enters and fits snugly in said sleeve with which. it has a swiveled connection by means of an annular internal bead 1 in the sleeve which engages a corresponding annular external groove 2 in the front end of the sheath 7:, thus permitting the latter to have free rotary movement upon the body portion of the pencil, without lengthwise movement thereon. The sheath h and body portion A are thus held firmly together While at the same time they are free to rotate relatively to one another and produce a corresponding rotary movement of the propeling screw as in my Patent No. 986,896, hereinbefore named.

The sheath h is continued a sufficient length rearwardly beyond the cup-shaped head 9 which it contains to provide a reservoir for holding a supply of extra leads, the reservoir being conveniently closed at one end by the head 9' the bottom of which forms the bottom of the reservoir, and at the other end by a removable cap 11 (Figs. 1 and 2).

The pencil proper-shown in Fig. 2thus complete and ready for operation, is then inserted into a sheet metal tubular pencil case m in which it snugly fits, the tubular stem a of the nozzle end of the body portion A of the pencil extending into the tapered front end m of the case up to the lead. orifice therein with which it registers, and the cylindrical body of the case inclosing the body portion A of the pencil proper to which it is made fast, and also encircling the sheath h, to which however it is not made fast, bringing up against an annular bead or shoulder h on that portion of the sheath which protrudes from the rear end of the pencil case and forms the lead reservoir as well. as a handle by which the sheath may be rotated. The cap fits upon that portion of the sheath h which projects rearwardly beyond the head it and is left uncovered by the pencil case m. The cap forms a convenient means by which the swiveled sheath 7b can be rotated relatively to the body portion of the pencil. Suitable means are provided whereby, when the cap 2' is in place on the lead reservoir end of sheath 7a, the two will be engaged. so as to rotate to gether; for which purpose, in the present instance, the open rear end of the sheath is toothed as shown at [L2, to engage a pin or other projection i on the inside of the cap, when the cap is pressed down in place.

In the particular arrangement here shown the move/ment, so called, acts to advance the lead only; but obviouslyas for in stance by providing the front end of the pusher rod with a socket to receive the rear end of the lead-it can be used both to ad vance and retract the lead.

The arrangement as a whole is neat, simple, and exceedingly compact, with ample provision for holding a supply of leads.

Having described my improvements and the best way now known to me of carrying the same into practical effect, what I claim herein as new and of my invention is 1. The main body portion of the pencil and barrel. connected therewith, the lead advancer housed in said barrel and capable of longitudinal movement only therein, and the rotatable propelling screw engaging and housed in said advancer and projecting beyond the rear end of the barrel in. combination with a tubular pencil case surrounding and secured fast to said body portion and provided with a tapered front end to receive the nozzle end of the same, and an intermediate sheath within the pencil case,

forming a housing for the barrel and having at its front end a swiveled connection with the body portion to permit its free rotary movement relatively to the said body portion and the external pencil case secured thereto, and at its rear end receiving and made fast to a head on the projecting end of the propelling screw, said sheath extending rearwardly beyond the end of the pencil case to provide a lead receptacle and an operating handle for the intermediate sheath and propeller screw secured thereto. 2. In combination with elements specified in claim 1, a cap removably fitted upon the rear end of the sheath. and means whereby when the cap is thus fitted thereon the two shall be engaged so as to rotate together.

In testimony whereof I affix my signature.

CLAES M. BOMAN 

